__tfork() needs to set the stack address of the new thread in the kernel,
so that it can't get a signal while still running on the parent thread's
stack. Also, pass in sizeof(struct __tfork) to prov

__tfork() needs to set the stack address of the new thread in the kernel,
so that it can't get a signal while still running on the parent thread's
stack. Also, pass in sizeof(struct __tfork) to provide forward compat
when more members are added. This is an ABI change, so switch syscall
numbers and bump lib majors this time.

ok deraadt@ matthew@

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merge various differences between hppa and hppa64
ok jsing

Save and restore cr27 and add the necessary glue to use it as the userland
thread register.

ok guenther@, jsing@

update copyright; miod@ is fine w/ files where he holds it too

hptmask goes away as a register and frees one tmp cr

typos

ok jmc@

no need for reg.h in the frame.h

do not rely on u_int being availabel

new pcb and frame layouts

fix argument access macro (+1 fuzz), align frame per hp requirements

define call frame offsets and argument access macros, add space for cr28 in trapframe

littel perfomance rearngement, also cr23 and cr28 for ddb

export cr28 for DEBUGging purposes

do not include fpu regs into trapframe, according to the
lazy fpu context switching it could be well saved into pcb.
this brings trapframe to 256 bytes (including 5 spare words).
adjust all the code

do not include fpu regs into trapframe, according to the
lazy fpu context switching it could be well saved into pcb.
this brings trapframe to 256 bytes (including 5 spare words).
adjust all the code to deal w/ moved fpu regs save area.

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name changes, add stack frame, better USERMODE()

fix special tr* registers names, spaces vs tabs

USERMODE() and FRAME_PC definitions

more includes

some includes